9 files changed, 488 insertions, 46 deletions

diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 65dd251f3..d0c014e9d 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -322,6 +322,32 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
     end
   end
 
+  def react_with_emoji(user, object, emoji, options \\ []) do
+    with local <- Keyword.get(options, :local, true),
+         activity_id <- Keyword.get(options, :activity_id, nil),
+         Pleroma.Emoji.is_unicode_emoji?(emoji),
+         reaction_data <- make_emoji_reaction_data(user, object, emoji, activity_id),
+         {:ok, activity} <- insert(reaction_data, local),
+         {:ok, object} <- add_emoji_reaction_to_object(activity, object),
+         :ok <- maybe_federate(activity) do
+      {:ok, activity, object}
+    end
+  end
+
+  def unreact_with_emoji(user, reaction_id, options \\ []) do
+    with local <- Keyword.get(options, :local, true),
+         activity_id <- Keyword.get(options, :activity_id, nil),
+         user_ap_id <- user.ap_id,
+         %Activity{actor: ^user_ap_id} = reaction_activity <- Activity.get_by_ap_id(reaction_id),
+         object <- Object.normalize(reaction_activity),
+         unreact_data <- make_undo_data(user, reaction_activity, activity_id),
+         {:ok, activity} <- insert(unreact_data, local),
+         {:ok, object} <- remove_emoji_reaction_from_object(reaction_activity, object),
+         :ok <- maybe_federate(activity) do
+      {:ok, activity, object}
+    end
+  end
+
   # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
   def like(
         %User{ap_id: ap_id} = user,
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 91a164eff..15612545b 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -566,6 +566,34 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     end
   end
 
+  @misskey_reactions %{
+    "like" => "👍",
+    "love" => "❤️",
+    "laugh" => "😆",
+    "hmm" => "🤔",
+    "surprise" => "😮",
+    "congrats" => "🎉",
+    "angry" => "💢",
+    "confused" => "😥",
+    "rip" => "😇",
+    "pudding" => "🍮",
+    "star" => "⭐"
+  }
+
+  @doc "Rewrite misskey likes into EmojiReactions"
+  def handle_incoming(
+        %{
+          "type" => "Like",
+          "_misskey_reaction" => reaction
+        } = data,
+        options
+      ) do
+    data
+    |> Map.put("type", "EmojiReaction")
+    |> Map.put("content", @misskey_reactions[reaction] || reaction)
+    |> handle_incoming(options)
+  end
+
   def handle_incoming(
         %{"type" => "Like", "object" => object_id, "actor" => _actor, "id" => id} = data,
         _options
@@ -581,6 +609,27 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   end
 
   def handle_incoming(
+        %{
+          "type" => "EmojiReaction",
+          "object" => object_id,
+          "actor" => _actor,
+          "id" => id,
+          "content" => emoji
+        } = data,
+        _options
+      ) do
+    with actor <- Containment.get_actor(data),
+         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
+         {:ok, object} <- get_obj_helper(object_id),
+         {:ok, activity, _object} <-
+           ActivityPub.react_with_emoji(actor, object, emoji, activity_id: id, local: false) do
+      {:ok, activity}
+    else
+      _e -> :error
+    end
+  end
+
+  def handle_incoming(
         %{"type" => "Announce", "object" => object_id, "actor" => _actor, "id" => id} = data,
         _options
       ) do
@@ -718,6 +767,28 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   def handle_incoming(
         %{
           "type" => "Undo",
+          "object" => %{"type" => "EmojiReaction", "id" => reaction_activity_id},
+          "actor" => _actor,
+          "id" => id
+        } = data,
+        _options
+      ) do
+    with actor <- Containment.get_actor(data),
+         {:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
+         {:ok, activity, _} <-
+           ActivityPub.unreact_with_emoji(actor, reaction_activity_id,
+             activity_id: id,
+             local: false
+           ) do
+      {:ok, activity}
+    else
+      _e -> :error
+    end
+  end
+
+  def handle_incoming(
+        %{
+          "type" => "Undo",
           "object" => %{"type" => "Block", "object" => blocked},
           "actor" => blocker,
           "id" => id
@@ -1048,7 +1119,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     Map.put(object, "attachment", attachments)
   end
 
-  defp strip_internal_fields(object) do
+  def strip_internal_fields(object) do
     object
     |> Map.drop(Pleroma.Constants.object_internal_fields())
   end
diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
index d812fd734..c45662359 100644
--- a/lib/pleroma/web/activity_pub/utils.ex
+++ b/lib/pleroma/web/activity_pub/utils.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.Web
+  alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.ActivityPub.Visibility
   alias Pleroma.Web.AdminAPI.AccountView
   alias Pleroma.Web.Endpoint
@@ -255,6 +256,16 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Repo.one()
   end
 
+  @doc """
+  Returns like activities targeting an object
+  """
+  def get_object_likes(%{data: %{"id" => id}}) do
+    id
+    |> Activity.Queries.by_object_id()
+    |> Activity.Queries.by_type("Like")
+    |> Repo.all()
+  end
+
   @spec make_like_data(User.t(), map(), String.t()) :: map()
   def make_like_data(
         %User{ap_id: ap_id} = actor,
@@ -286,13 +297,30 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> maybe_put("id", activity_id)
   end
 
+  def make_emoji_reaction_data(user, object, emoji, activity_id) do
+    make_like_data(user, object, activity_id)
+    |> Map.put("type", "EmojiReaction")
+    |> Map.put("content", emoji)
+  end
+
   @spec update_element_in_object(String.t(), list(any), Object.t()) ::
           {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
   def update_element_in_object(property, element, object) do
+    length =
+      if is_map(element) do
+        element
+        |> Map.values()
+        |> List.flatten()
+        |> length()
+      else
+        element
+        |> length()
+      end
+
     data =
       Map.merge(
         object.data,
-        %{"#{property}_count" => length(element), "#{property}s" => element}
+        %{"#{property}_count" => length, "#{property}s" => element}
       )
 
     object
@@ -300,6 +328,38 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Object.update_and_set_cache()
   end
 
+  @spec add_emoji_reaction_to_object(Activity.t(), Object.t()) ::
+          {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
+
+  def add_emoji_reaction_to_object(
+        %Activity{data: %{"content" => emoji, "actor" => actor}},
+        object
+      ) do
+    reactions = object.data["reactions"] || %{}
+    emoji_actors = reactions[emoji] || []
+    new_emoji_actors = [actor | emoji_actors] |> Enum.uniq()
+    new_reactions = Map.put(reactions, emoji, new_emoji_actors)
+    update_element_in_object("reaction", new_reactions, object)
+  end
+
+  def remove_emoji_reaction_from_object(
+        %Activity{data: %{"content" => emoji, "actor" => actor}},
+        object
+      ) do
+    reactions = object.data["reactions"] || %{}
+    emoji_actors = reactions[emoji] || []
+    new_emoji_actors = List.delete(emoji_actors, actor)
+
+    new_reactions =
+      if new_emoji_actors == [] do
+        Map.delete(reactions, emoji)
+      else
+        Map.put(reactions, emoji, new_emoji_actors)
+      end
+
+    update_element_in_object("reaction", new_reactions, object)
+  end
+
   @spec add_like_to_object(Activity.t(), Object.t()) ::
           {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
   def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
@@ -397,6 +457,19 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Repo.one()
   end
 
+  def get_latest_reaction(internal_activity_id, %{ap_id: ap_id}, emoji) do
+    %{data: %{"object" => object_ap_id}} = Activity.get_by_id(internal_activity_id)
+
+    "EmojiReaction"
+    |> Activity.Queries.by_type()
+    |> where(actor: ^ap_id)
+    |> where([activity], fragment("?->>'content' = ?", activity.data, ^emoji))
+    |> Activity.Queries.by_object_id(object_ap_id)
+    |> order_by([activity], fragment("? desc nulls last", activity.id))
+    |> limit(1)
+    |> Repo.one()
+  end
+
   #### Announce-related helpers
 
   @doc """
@@ -489,6 +562,25 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> maybe_put("id", activity_id)
   end
 
+  def make_undo_data(
+        %User{ap_id: actor, follower_address: follower_address},
+        %Activity{
+          data: %{"id" => undone_activity_id, "context" => context},
+          actor: undone_activity_actor
+        },
+        activity_id \\ nil
+      ) do
+    %{
+      "type" => "Undo",
+      "actor" => actor,
+      "object" => undone_activity_id,
+      "to" => [follower_address, undone_activity_actor],
+      "cc" => [Pleroma.Constants.as_public()],
+      "context" => context
+    }
+    |> maybe_put("id", activity_id)
+  end
+
   @spec add_announce_to_object(Activity.t(), Object.t()) ::
           {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
   def add_announce_to_object(
@@ -615,26 +707,31 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   def make_flag_data(_, _), do: %{}
 
   defp build_flag_object(%{account: account, statuses: statuses} = _) do
-    [account.ap_id] ++
-      Enum.map(statuses || [], fn act ->
-        id =
-          case act do
-            %Activity{} = act -> act.data["id"]
-            act when is_map(act) -> act["id"]
-            act when is_binary(act) -> act
-          end
+    [account.ap_id] ++ build_flag_object(%{statuses: statuses})
+  end
+
+  defp build_flag_object(%{statuses: statuses}) do
+    Enum.map(statuses || [], &build_flag_object/1)
+  end
 
-        activity = Activity.get_by_ap_id_with_object(id)
-        actor = User.get_by_ap_id(activity.object.data["actor"])
+  defp build_flag_object(act) when is_map(act) or is_binary(act) do
+    id =
+      case act do
+        %Activity{} = act -> act.data["id"]
+        act when is_map(act) -> act["id"]
+        act when is_binary(act) -> act
+      end
 
-        %{
-          "type" => "Note",
-          "id" => activity.data["id"],
-          "content" => activity.object.data["content"],
-          "published" => activity.object.data["published"],
-          "actor" => AccountView.render("show.json", %{user: actor})
-        }
-      end)
+    activity = Activity.get_by_ap_id_with_object(id)
+    actor = User.get_by_ap_id(activity.object.data["actor"])
+
+    %{
+      "type" => "Note",
+      "id" => activity.data["id"],
+      "content" => activity.object.data["content"],
+      "published" => activity.object.data["published"],
+      "actor" => AccountView.render("show.json", %{user: actor})
+    }
   end
 
   defp build_flag_object(_), do: []
@@ -679,6 +776,94 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   end
 
   #### Report-related helpers
+  def get_reports(params, page, page_size) do
+    params =
+      params
+      |> Map.put("type", "Flag")
+      |> Map.put("skip_preload", true)
+      |> Map.put("total", true)
+      |> Map.put("limit", page_size)
+      |> Map.put("offset", (page - 1) * page_size)
+
+    ActivityPub.fetch_activities([], params, :offset)
+  end
+
+  @spec get_reports_grouped_by_status(%{required(:activity) => String.t()}) :: %{
+          required(:groups) => [
+            %{
+              required(:date) => String.t(),
+              required(:account) => %{},
+              required(:status) => %{},
+              required(:actors) => [%User{}],
+              required(:reports) => [%Activity{}]
+            }
+          ],
+          required(:total) => integer
+        }
+  def get_reports_grouped_by_status(groups) do
+    parsed_groups =
+      groups
+      |> Enum.map(fn entry ->
+        activity =
+          case Jason.decode(entry.activity) do
+            {:ok, activity} -> activity
+            _ -> build_flag_object(entry.activity)
+          end
+
+        parse_report_group(activity)
+      end)
+
+    %{
+      groups: parsed_groups
+    }
+  end
+
+  def parse_report_group(activity) do
+    reports = get_reports_by_status_id(activity["id"])
+    max_date = Enum.max_by(reports, &NaiveDateTime.from_iso8601!(&1.data["published"]))
+    actors = Enum.map(reports, & &1.user_actor)
+
+    %{
+      date: max_date.data["published"],
+      account: activity["actor"],
+      status: %{
+        id: activity["id"],
+        content: activity["content"],
+        published: activity["published"]
+      },
+      actors: Enum.uniq(actors),
+      reports: reports
+    }
+  end
+
+  def get_reports_by_status_id(ap_id) do
+    from(a in Activity,
+      where: fragment("(?)->>'type' = 'Flag'", a.data),
+      where: fragment("(?)->'object' @> ?", a.data, ^[%{id: ap_id}])
+    )
+    |> Activity.with_preloaded_user_actor()
+    |> Repo.all()
+  end
+
+  @spec get_reported_activities() :: [
+          %{
+            required(:activity) => String.t(),
+            required(:date) => String.t()
+          }
+        ]
+  def get_reported_activities do
+    from(a in Activity,
+      where: fragment("(?)->>'type' = 'Flag'", a.data),
+      select: %{
+        date: fragment("max(?->>'published') date", a.data),
+        activity:
+          fragment("jsonb_array_elements_text((? #- '{object,0}')->'object') activity", a.data)
+      },
+      group_by: fragment("activity"),
+      order_by: fragment("date DESC")
+    )
+    |> Repo.all()
+  end
 
   def update_report_state(%Activity{} = activity, state)
       when state in @strip_status_report_states do
@@ -702,6 +887,18 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     |> Repo.update()
   end
 
+  def update_report_state(activity_ids, state) when state in @supported_report_states do
+    activities_num = length(activity_ids)
+
+    from(a in Activity, where: a.id in ^activity_ids)
+    |> update(set: [data: fragment("jsonb_set(data, '{state}', ?)", ^state)])
+    |> Repo.update_all([])
+    |> case do
+      {^activities_num, _} -> :ok
+      _ -> {:error, activity_ids}
+    end
+  end
+
   def update_report_state(_, _), do: {:error, "Unsupported state"}
 
   def strip_report_status_data(activity) do
diff --git a/lib/pleroma/web/admin_api/admin_api_controller.ex b/lib/pleroma/web/admin_api/admin_api_controller.ex
index 30fc01755..8c1318d1b 100644
--- a/lib/pleroma/web/admin_api/admin_api_controller.ex
+++ b/lib/pleroma/web/admin_api/admin_api_controller.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
   alias Pleroma.UserInviteToken
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.ActivityPub.Relay
+  alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.AdminAPI.AccountView
   alias Pleroma.Web.AdminAPI.Config
   alias Pleroma.Web.AdminAPI.ConfigView
@@ -624,19 +625,17 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
   def list_reports(conn, params) do
     {page, page_size} = page_params(params)
 
-    params =
-      params
-      |> Map.put("type", "Flag")
-      |> Map.put("skip_preload", true)
-      |> Map.put("total", true)
-      |> Map.put("limit", page_size)
-      |> Map.put("offset", (page - 1) * page_size)
+    conn
+    |> put_view(ReportView)
+    |> render("index.json", %{reports: Utils.get_reports(params, page, page_size)})
+  end
 
-    reports = ActivityPub.fetch_activities([], params, :offset)
+  def list_grouped_reports(conn, _params) do
+    reports = Utils.get_reported_activities()
 
     conn
     |> put_view(ReportView)
-    |> render("index.json", %{reports: reports})
+    |> render("index_grouped.json", Utils.get_reports_grouped_by_status(reports))
   end
 
   def report_show(conn, %{"id" => id}) do
@@ -649,17 +648,26 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
     end
   end
 
-  def report_update_state(%{assigns: %{user: admin}} = conn, %{"id" => id, "state" => state}) do
-    with {:ok, report} <- CommonAPI.update_report_state(id, state) do
-      ModerationLog.insert_log(%{
-        action: "report_update",
-        actor: admin,
-        subject: report
-      })
+  def reports_update(%{assigns: %{user: admin}} = conn, %{"reports" => reports}) do
+    result =
+      reports
+      |> Enum.map(fn report ->
+        with {:ok, activity} <- CommonAPI.update_report_state(report["id"], report["state"]) do
+          ModerationLog.insert_log(%{
+            action: "report_update",
+            actor: admin,
+            subject: activity
+          })
+
+          activity
+        else
+          {:error, message} -> %{id: report["id"], error: message}
+        end
+      end)
 
-      conn
-      |> put_view(ReportView)
-      |> render("show.json", Report.extract_report_info(report))
+    case Enum.any?(result, &Map.has_key?(&1, :error)) do
+      true -> json_response(conn, :bad_request, result)
+      false -> json_response(conn, :no_content, "")
     end
   end
 
diff --git a/lib/pleroma/web/admin_api/views/report_view.ex b/lib/pleroma/web/admin_api/views/report_view.ex
index 101a74c63..ca88595c7 100644
--- a/lib/pleroma/web/admin_api/views/report_view.ex
+++ b/lib/pleroma/web/admin_api/views/report_view.ex
@@ -42,6 +42,26 @@ defmodule Pleroma.Web.AdminAPI.ReportView do
     }
   end
 
+  def render("index_grouped.json", %{groups: groups}) do
+    reports =
+      Enum.map(groups, fn group ->
+        %{
+          date: group[:date],
+          account: group[:account],
+          status: group[:status],
+          actors: Enum.map(group[:actors], &merge_account_views/1),
+          reports:
+            group[:reports]
+            |> Enum.map(&Report.extract_report_info(&1))
+            |> Enum.map(&render(__MODULE__, "show.json", &1))
+        }
+      end)
+
+    %{
+      reports: reports
+    }
+  end
+
   defp merge_account_views(%User{} = user) do
     Pleroma.Web.MastodonAPI.AccountView.render("show.json", %{user: user})
     |> Map.merge(Pleroma.Web.AdminAPI.AccountView.render("show.json", %{user: user}))
diff --git a/lib/pleroma/web/common_api/common_api.ex b/lib/pleroma/web/common_api/common_api.ex
index e57345621..fe6e26a90 100644
--- a/lib/pleroma/web/common_api/common_api.ex
+++ b/lib/pleroma/web/common_api/common_api.ex
@@ -120,6 +120,25 @@ defmodule Pleroma.Web.CommonAPI do
     end
   end
 
+  def react_with_emoji(id, user, emoji) do
+    with %Activity{} = activity <- Activity.get_by_id(id),
+         object <- Object.normalize(activity) do
+      ActivityPub.react_with_emoji(user, object, emoji)
+    else
+      _ ->
+        {:error, dgettext("errors", "Could not add reaction emoji")}
+    end
+  end
+
+  def unreact_with_emoji(id, user, emoji) do
+    with %Activity{} = reaction_activity <- Utils.get_latest_reaction(id, user, emoji) do
+      ActivityPub.unreact_with_emoji(user, reaction_activity.data["id"])
+    else
+      _ ->
+        {:error, dgettext("errors", "Could not remove reaction emoji")}
+    end
+  end
+
   def vote(user, %{data: %{"type" => "Question"}} = object, choices) do
     with :ok <- validate_not_author(object, user),
          :ok <- validate_existing_votes(user, object),
@@ -351,6 +370,13 @@ defmodule Pleroma.Web.CommonAPI do
     end
   end
 
+  def update_report_state(activity_ids, state) when is_list(activity_ids) do
+    case Utils.update_report_state(activity_ids, state) do
+      :ok -> {:ok, activity_ids}
+      _ -> {:error, dgettext("errors", "Could not update state")}
+    end
+  end
+
   def update_report_state(activity_id, state) do
     with %Activity{} = activity <- Activity.get_by_id(activity_id) do
       Utils.update_report_state(activity, state)
diff --git a/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex b/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
index 651a99423..8fed3f5bb 100644
--- a/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
+++ b/lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
@@ -7,10 +7,15 @@ defmodule Pleroma.Web.PleromaAPI.PleromaAPIController do
 
   import Pleroma.Web.ControllerHelper, only: [add_link_headers: 2]
 
+  alias Pleroma.Activity
   alias Pleroma.Conversation.Participation
   alias Pleroma.Notification
+  alias Pleroma.Object
   alias Pleroma.Plugs.OAuthScopesPlug
+  alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.CommonAPI
+  alias Pleroma.Web.MastodonAPI.AccountView
   alias Pleroma.Web.MastodonAPI.ConversationView
   alias Pleroma.Web.MastodonAPI.NotificationView
   alias Pleroma.Web.MastodonAPI.StatusView
@@ -29,6 +34,47 @@ defmodule Pleroma.Web.PleromaAPI.PleromaAPIController do
 
   plug(Pleroma.Plugs.EnsurePublicOrAuthenticatedPlug)
 
+  def emoji_reactions_by(%{assigns: %{user: user}} = conn, %{"id" => activity_id}) do
+    with %Activity{} = activity <- Activity.get_by_id_with_object(activity_id),
+         %Object{data: %{"reactions" => emoji_reactions}} <- Object.normalize(activity) do
+      reactions =
+        emoji_reactions
+        |> Enum.map(fn {emoji, users} ->
+          users = Enum.map(users, &User.get_cached_by_ap_id/1)
+          {emoji, AccountView.render("index.json", %{users: users, for: user, as: :user})}
+        end)
+        |> Enum.into(%{})
+
+      conn
+      |> json(reactions)
+    else
+      _e ->
+        conn
+        |> json(%{})
+    end
+  end
+
+  def react_with_emoji(%{assigns: %{user: user}} = conn, %{"id" => activity_id, "emoji" => emoji}) do
+    with {:ok, _activity, _object} <- CommonAPI.react_with_emoji(activity_id, user, emoji),
+         activity <- Activity.get_by_id(activity_id) do
+      conn
+      |> put_view(StatusView)
+      |> render("show.json", %{activity: activity, for: user, as: :activity})
+    end
+  end
+
+  def unreact_with_emoji(%{assigns: %{user: user}} = conn, %{
+        "id" => activity_id,
+        "emoji" => emoji
+      }) do
+    with {:ok, _activity, _object} <- CommonAPI.unreact_with_emoji(activity_id, user, emoji),
+         activity <- Activity.get_by_id(activity_id) do
+      conn
+      |> put_view(StatusView)
+      |> render("show.json", %{activity: activity, for: user, as: :activity})
+    end
+  end
+
   def conversation(%{assigns: %{user: user}} = conn, %{"id" => participation_id}) do
     with %Participation{} = participation <- Participation.get(participation_id),
          true <- user.id == participation.user_id do
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index ecf5f744c..9b8b373b8 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -178,8 +178,9 @@ defmodule Pleroma.Web.Router do
     get("/users/:nickname/statuses", AdminAPIController, :list_user_statuses)
 
     get("/reports", AdminAPIController, :list_reports)
+    get("/grouped_reports", AdminAPIController, :list_grouped_reports)
     get("/reports/:id", AdminAPIController, :report_show)
-    put("/reports/:id", AdminAPIController, :report_update_state)
+    patch("/reports", AdminAPIController, :reports_update)
     post("/reports/:id/respond", AdminAPIController, :report_respond)
 
     put("/statuses/:id", AdminAPIController, :status_update)
@@ -261,6 +262,12 @@ defmodule Pleroma.Web.Router do
   end
 
   scope "/api/v1/pleroma", Pleroma.Web.PleromaAPI do
+    pipe_through(:api)
+
+    get("/statuses/:id/emoji_reactions_by", PleromaAPIController, :emoji_reactions_by)
+  end
+
+  scope "/api/v1/pleroma", Pleroma.Web.PleromaAPI do
     scope [] do
       pipe_through(:authenticated_api)
 
@@ -273,6 +280,8 @@ defmodule Pleroma.Web.Router do
       pipe_through(:authenticated_api)
 
       patch("/conversations/:id", PleromaAPIController, :update_conversation)
+      post("/statuses/:id/react_with_emoji", PleromaAPIController, :react_with_emoji)
+      post("/statuses/:id/unreact_with_emoji", PleromaAPIController, :unreact_with_emoji)
       post("/notifications/read", PleromaAPIController, :read_notification)
 
       patch("/accounts/update_avatar", AccountController, :update_avatar)
diff --git a/lib/pleroma/web/static_fe/static_fe_controller.ex b/lib/pleroma/web/static_fe/static_fe_controller.ex
index 5e60c82b0..8ccf15f4b 100644
--- a/lib/pleroma/web/static_fe/static_fe_controller.ex
+++ b/lib/pleroma/web/static_fe/static_fe_controller.ex
@@ -27,6 +27,12 @@ defmodule Pleroma.Web.StaticFE.StaticFEController do
 
   defp get_title(_), do: nil
 
+  defp not_found(conn, message) do
+    conn
+    |> put_status(404)
+    |> render("error.html", %{message: message, meta: ""})
+  end
+
   def get_counts(%Activity{} = activity) do
     %Object{data: data} = Object.normalize(activity)
 
@@ -77,10 +83,13 @@ defmodule Pleroma.Web.StaticFE.StaticFEController do
 
       render(conn, "conversation.html", %{activities: timeline, meta: meta})
     else
-      _ ->
+      %Activity{object: %Object{data: data}} ->
         conn
-        |> put_status(404)
-        |> render("error.html", %{message: "Post not found.", meta: ""})
+        |> put_status(:found)
+        |> redirect(external: data["url"] || data["external_url"] || data["id"])
+
+      _ ->
+        not_found(conn, "Post not found.")
     end
   end
 
@@ -108,9 +117,33 @@ defmodule Pleroma.Web.StaticFE.StaticFEController do
         })
 
       _ ->
-        conn
-        |> put_status(404)
-        |> render("error.html", %{message: "User not found.", meta: ""})
+        not_found(conn, "User not found.")
+    end
+  end
+
+  def show(%{assigns: %{object_id: _}} = conn, _params) do
+    url = Helpers.url(conn) <> conn.request_path
+
+    case Activity.get_create_by_object_ap_id_with_object(url) do
+      %Activity{} = activity ->
+        to = Helpers.o_status_path(Pleroma.Web.Endpoint, :notice, activity)
+        redirect(conn, to: to)
+
+      _ ->
+        not_found(conn, "Post not found.")
+    end
+  end
+
+  def show(%{assigns: %{activity_id: _}} = conn, _params) do
+    url = Helpers.url(conn) <> conn.request_path
+
+    case Activity.get_by_ap_id(url) do
+      %Activity{} = activity ->
+        to = Helpers.o_status_path(Pleroma.Web.Endpoint, :notice, activity)
+        redirect(conn, to: to)
+
+      _ ->
+        not_found(conn, "Post not found.")
     end
   end
 
@@ -120,5 +153,11 @@ defmodule Pleroma.Web.StaticFE.StaticFEController do
   def assign_id(%{path_info: ["users", user_id]} = conn, _opts),
     do: assign(conn, :username_or_id, user_id)
 
+  def assign_id(%{path_info: ["objects", object_id]} = conn, _opts),
+    do: assign(conn, :object_id, object_id)
+
+  def assign_id(%{path_info: ["activities", activity_id]} = conn, _opts),
+    do: assign(conn, :activity_id, activity_id)
+
   def assign_id(conn, _opts), do: conn
 end